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Decay constants of the Bc mesons with vector and tensor currents

  • Eduard Costa i Reina
  • Nico Gubernari
  • Zachary Wüthrich
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Abstract

We calculate the decay constants of the lowest-lying Bc mesons in the spin-parity channels JP = 0-, 0+, 1-, 1+, commonly referred to as the Bc, Bc0*, Bc*, Bc1 mesons, respectively. Within the framework of QCD sum rules, we consider the decay constants associated with both the (axial-)vector and (axial-)tensor interpolating currents. The decay constants with (axial-)vector currents have already been studied in the literature. We refine previous QCD sum rule results by including higher-order power corrections and performing a comprehensive uncertainty analysis. Furthermore, we provide the first determination of the (axial-)tensor decay constants of the Bc* and Bc1 mesons. These new results will not only improve theoretical predictions for purely leptonic Bc decays, but also strengthen unitarity constraints on b → c form factors, thereby improving the precision of predictions for B̅ → D(*) ℓ ν̅ decays and the determination of |Vcb|.

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Cite

BibTeXRIS
BibTeX
@misc{reina2026decay,
  title = {{Decay constants of the $B_c$ mesons with vector and tensor currents}},
  author = {Eduard Costa i Reina and Nico Gubernari and Zachary Wüthrich},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2606.25733},
  eprint = {2606.25733},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2606.25733},
}
RIS
TY  - UNPB
TI  - Decay constants of the B_c mesons with vector and tensor currents
AU  - Eduard Costa i Reina
AU  - Nico Gubernari
AU  - Zachary Wüthrich
PY  - 2026
DA  - 2026/09/07
PB  - arXiv
DO  - 10.48550/arxiv.2606.25733
UR  - https://arxiv.org/abs/2606.25733
AB  - We calculate the decay constants of the lowest-lying B_c mesons in the spin-parity channels J^P = 0^-, 0^+, 1^-, 1^+, commonly referred to as the B_c, B_c0^*, B_c^*, B_c1 mesons, respectively. Within the framework of QCD sum rules, we consider the decay constants associated with both the (axial-)vector and (axial-)tensor interpolating currents. The decay constants with (axial-)vector currents have already been studied in the literature. We refine previous QCD sum rule results by including higher-order power corrections and performing a comprehensive uncertainty analysis. Furthermore, we provide the first determination of the (axial-)tensor decay constants of the B_c^* and B_c1 mesons. These new results will not only improve theoretical predictions for purely leptonic B_c decays, but also strengthen unitarity constraints on b → c form factors, thereby improving the precision of predictions for B̅ → D^(*) ℓ ν̅ decays and the determination of |V_cb|.
ER  -